Question

我有这段代码，

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSUInteger row = indexPath.row;
    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    UIViewController <SubstitutableDetailViewController> *detailViewController = nil;
    if (row == 0) {
        FirstDetailViewController *newDetailViewController = [[FirstDetailViewController alloc] initWithNibName:@"FirstDetailView" bundle:nil];
        detailViewController = newDetailViewController;
    }

    if (row == 1) {
        SecondDetailViewController *newDetailViewController = [[SecondDetailViewController alloc] initWithNibName:@"SecondDetailView" bundle:nil];
        detailViewController = newDetailViewController;
    }

    if (row == 2) {
        view31 *newDetailViewController = [[view31 alloc] initWithNibName:@"view31" bundle:nil];
        detailViewController = newDetailViewController;

        NSLog(@"%@", detailViewController);
    }

    // Update the split view controller's view controllers array.

    NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController , detailViewController, nil];

    // NSArray *newVCs = [NSArray arrayWithObjects:[self.splitViewController.viewControllers objectAtIndex:0], viewControllers, nil];

    NSLog(@"%@", viewControllers);

    self.splitViewController.viewControllers = viewControllers;
    NSLog(@"%@", self.splitViewController.viewControllers);

    [viewControllers release];

    // Dismiss the popover if it's present.
    if (popoverController != nil) {
        [popoverController dismissPopoverAnimated:YES];
    }

    // Configure the new view controller's popover button (after the view has been displayed and its toolbar/navigation bar has been created).
    if (rootPopoverButtonItem != nil) {
        [detailViewController showRootPopoverButtonItem:self.rootPopoverButtonItem];
    }

    [detailViewController release];
}

为什么self.splitViewController.viewControllers = viewControllers;会返回null？

Answer 1

尝试将detailViewController的值添加到viewControllers时检查它的值。

Answer 2

我面临同样的问题...... 好吧......我认为你没有看到任何viewControllers，因为只有当用户点击rootviewcontroller中的一行时才会调用此方法。只有这样才能将detailviewcontroller分配给数组。

因此，如果点击视图控制器，您将重新分配数组属性。

现在很有意思，因为当我加载该文件时，我也没有将控制器分配给该splitview控制器数组。

iPad的splitViewController返回null

2 个答案: